PHYS 44 |
| Photodissociation spectroscopy now permits the direct and facile experimental measurement of high quality IR spectra of ions generated from diverse hydrocarbons. This talk describes collaborative research with Professor M. A. Duncan's group in Georgia, who have devised and refined methods for generating and observing the IR spectra of charged species in the gas phase. Thus, saturated and unsaturated hydrocarbons can be protonated directly under conditions where they complex with an argon or another "tag." Excitation of these complexes with tunable lasers results in sharp photodissociation spectra over a wide IR frequency range (4000-800 cm-1). The match of computed vibrational frequencies and intensities with the experimental data establish the structures of the ions. In effect, any peak in a mass spectrum can be chosen, characterized, and its nature elucidated in detail by this combined experimental and theoretical approach. A selection of the numerous examples studied already, including some quite surprising results, will be described. |
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Computational Spectroscopy
1:20 PM-5:20 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 342, Oral
Division of Physical Chemistry |